Un authorized debits

I have been Telkom client for many years. I recently ordered a ADSL Wifi for 199. I then discovered 4months ago that i have been debited twice and i only have 1 account. I called to stop the debit and i have reversed the debit orders but they still debit. So far i have been debited 2500. I have been told bybone of the Agents that there was ***** in my account but they still continue debiting. I want to be refunded